ok thats kind of weird behavior now... can you just export that active link and import it once again... ...after that remove Public and save the Active Link, then again add Public Permission....

i am not able to think a logical reason behind this behavior...

you can also do one more thing after trying the above steps...go to user form and search the non admin user for whom you are facing this issue and put 0(zero) in the Group List Field and save that record in the User Form.. then you try lets see how it goes..

Just try to remove the Public permission.... Reassign the public permission in the ActiveLink and save it.

While saving with Dev Studio if it saves within 2seconds, that means it has not saved properly, there is a issue with DevStudio with Java, so before saving your workflow on 7.6.04 Dev Studio, put all the actions, permissions etc. then wait for 2 minutes and click save, to save the workflow.

i think win load/display is not applicable for the Dialog Mode...so having an Active Link on Win Load/display for the Dialog Mode may not help you... only Win Open is applicable for the Dialog Mode.....